Thermostat and thermometer.



L. G. COPEMAN.

THBRMOSTAT AND THERMOMETER. v

APPLICATION FILED JULY 28, 1911. v

' Patented Mar. 11, 1913 jun/n T [wranfar [2 47 GrafJf CopemanWz'tnesses' %7% m 44.1w WM NITED STATES PATENT oFFroE.

LLOYD GEOFF COPEMAN, OF FLINT, MICHIGAN, ASSIGNOR TO THE COPEMANELECTRIC STOVE COMPANY, OF FLINT, MICHIGAN, A CORPORATION OF MICHIGAN.

THERMOSTAT AND THERMOMETER.

To all whom it may concern:

Be it known that I, LLOYD Gnorr GoPE- MAN, a citizen of the UnitedStates' of America,-residing at. Flint, in the county of Genesee andState of Michigan, have invented certain new and useful Improvements inThermostats and Thermometers, of which the following is a specification,reference being had therein to the accompanying' drawings.

It is the object of the invention to obtain a, construction ofthermometer which is" applicable to an oven or other heater and which isprovided with a heat controlling means for limiting the temperature toany desired degree.

The invention consists in the construction as hereinafter set forth. 4

In the drawings,Figure l is a front elevation; Fig. 2 is a sideelevation partly in section.

A is a casing within which is arranged any suitable means operating uponchange in temperature for communicating movement to an index B travelingover a dial or indicator C. As the specific construction of the indexoperating me hanism forms no part of the present 1nvention it is notillustrated. D is a transparent face for the casing A arranged in frontof the dial 0 and spaced therefrom. E is a second index hand the hub ofwhich is arranged preferably in axial alinement with that of the index Bbut separated therefrom and movable in a parallel plane. The index E isprovided with an operating knob F which is arranged outside of thetransparent face D, the latter being formed of electrical insulatingmaterial. The shank G of the index E engages an electrical connection Hwhich extends outside of the case A and is insulated therefrom. There isalso preferably a cap member I for holding the transparent face upon thecasing A, and this cap member is insulated bothfrom the case and fromthe member H by suitably interposed insulation I.

The index hands B and E are provided with cooperating electrical contactmembers Specification of Letters Patent.

Application filed July 28, 1911.

J and K, which when the hands are in Patented Mar. 11, 1913.

Serial No. 641,001.

registration will come into contact with each other. An electric circuitL is arranged to have one lead thereof extending to the member H,whilethe other lead L is connected with the index hand B through theoperating connections therefor, and the metallic case A. Thus wheneverthe index hands B and E come in contact the circuit L will be closed andsuitable heat controlling or heat'regulating' devices not shown will beoperated by the closing of this circuit.

What I claim as my invention is:

l. The combination wit-h a case having a dial, of a thermometer havingan index hand movable over said dial, a transparent face in front ofsaid dial, a second index movable over said dial to different positionsof adjustment, a knob for operating said second index arranged outsideof the transparent face, co-acting electrical contacts on said indexmembers adapted to engage on the registration thereof. the electricallead to one of said contacts being through said case, and a cap forholding the transparent face upon the casing, said cap being insulatedfrom said case.

,2. The combination with a case having a dial, of a thermometer havingan index hand movable over said dial, a transparent face in front ofsaid case, a cap holding said face in position on said case, said cappartially surrounding said case and insulated therefrom, a second indexaxially arranged with the first index, a knob for actuating said secondindex extending outward through said transparent face cooperatingelectrical contacts on said index members adapted to engage upon theregistration thereof, the electrical lead to one of said contacts beingthrough said case and the other electrical connection being interposedbetween andinsulated from said case and cap.

In testimony whereof, I afiix my signature in presence of two witnesses.

LLOYD GROFF COPEMAN. Witnesses:

E. D. BLACK, DELLA Gr. SMITH.

